Loud-speaker envelope



May 20, 1930.

Filed Feb. 2, 1928 4 n m. 0 z m I R W H 4% z mu m m u m ruhnfl l l l n \llhnl l! i h l." p H WI 6' n b i 0 I J. a v z a 2 Wm M f Patented May 20, 1930 UNITED STATES ROY H. GULDMAN, OF NORTH TARRYTOWN. NEW YORK LOUD-SPEAKER ENVELOPE Application filed February 2, 1928. Serial No. 251,383.

This invention relates to acoustical devices,

and refers more particularly to a loudspeaker or amplifier element especially designed for use in connection with radio receiving sets.

The invention broadly comprehends an improved amplifier element in the nature of an envelope having substantially conical walls within which is arranged the unit for vibrating the same from the apex of one or both of said walls.

The invention furthermore comprehends an envelope amplifier element including opposed substantially conical walls secured together at the major portion of their marginal edges, leaving an open portion constituting a sound outlet and within which a speaking unit is arranged having a driving pin connected to the apex of one or both walls to operate in the manner of an ordinary cone speaker and in which a diaphragm speaking element may be further supported for vibrating the air column enclosed by the body and operating after the fashion of an ordinary horn speaker.

The invention further comprehends as an object, an amplifier element in the nature of a cone speaker, which while affording a large area, occupies a minimum space.

As a still further object, the invention comprehends a speaker envelope amplifier which ma house and work in conjunction with an ordinary form of cone speaker amplifier.

Other objects reside in the comparative simplicity of construction of the device, the economy with which the same may be produced, and the general efiiciency derived therefrom.

With the above recited and other objects in view, reference is had to the following description and accompan ing drawings in which there are exhibite certain examples or embodiments of the invention, while the appended claims define the actual scope of the invention.

In the drawings Figure 1 is a front view of a speaker constructed in accordance with the invention;

Fig. 2 is a vertical sectional view there- 50 through;

of, such as by stitching 17 or in any other desired manner. The unconnected edge of the wall 15 is provided with a pair of concave cut-out edges 18 presenting a central projection 19, while the unconnected portion of the wall 16 is provided with a pair of convex projecting edges 20. Intermediate or between the edges 20, the wall 16 is formed with an opening 21 fitted over the standard 11 while the central projection 19 is brought into contact with the central portion of the rear wall 16 and a screw or other fastening device 22 is passed therethrough and anchored to the standard. This obviously pro vides a pair of outlets 23. The cone s eaking unit 12 is connected to the apex 24 0 one or both walls 15 and 16 by the usual form of driving pin 25. Under this construction and arrangement it is obvious that sound vibrations transmitted to the envelope will be amplified in the usual manner of a cone speaker, while the column of air contained within the envelope will be vibrated by the diaphragm speaker 18. This construction also functions to produce more individual notes and less harmonics.

In the form of the invention illustrated in Fig. 3, the envelope 14 is of the same construction, but in this instance a second cone amplifier 2 6 ofthe ordinary type is mounted upon and operated by the same driving pin 25 which operates the envelope amplifier.

What is claimed is:

1. A sound amplifier, comprising an envelope body including substantially conical walls secured together at the major portion of their edges, leaving an open portion between their edges constituting a sound outlet, an actuating unit arranged Within the body having a driving pin connected to the apex of one wall, a supporting standard eX- tending through the open portion of the en velope body and supporting the actuating unit, and a diaphragm speaking element supported by the standard for vibrating the air column enclosed by the envelope body.

10 2. A sound amplifier, comprising anenvelope body including substantially conical walls secured together at the major portion of their edges, leaving an open portion between their edges constituting a sound outlet, an actuating unit Within the body having a drivin pin connected respectively to the apices 0t said walls, a supporting standard extending through the open portion of the I envelope body and supporting the actuating unit, and a diaphragm element supported by the standard for vibrating the air column enclosed by the envelope body.

" 3. A sound propagating device, comprising vibrating sound propagating Walls, an actuating unit therefor, and separate means for vibrating the air column defined within said walls.

4. A sound propagating device, comprising a pair of vibratory sound propagating surfaces, peripherally joined to form an air column therebetween, means for actuating said walls, and separate means for causing said air column to vibrate.

5. A sound propagating device, comprising 38 a pair of sound propagating cones having their peripheries joined to define an air column therebetween, and means for separately vibrating said cones and said air column.

6. A sound propagating device, comprising 49 a pair of sound propagating cones having their peripheries joined to define an air column therebetween, and means for separately vibrating said cones and said air column, said means including commonly actuated units positioned within said air column.

Signed at North Tarrytown in the county of Westchester and State of New York this 30 day of January, A. D. 1928. a

ROY H. GULDMAN. 

